Carnival of Space #444

Welcome, come in to the 444th Carnival of Space! The carnival is a community of space science and astronomy writers and bloggers, who submit their best work each week for your benefit. I’m Susie Murph, part of the team at Universe Today and now, on to this week’s stories! Our first stop is over at Aartscope , where Astroswanny continues a series of articles on Asteroid Astrometry, virtual impactors and the uncertainty parameter pending the close approach of 2013 TX68 on March 5th.